Satisfying the Einstein-Podolsky-Rosen criterion with massive particles

Year: 2015

Authors: Peise J., Kruse I., Lange K., Lucke B., Pezze L., Arlt J., Ertmer W., Hammerer K., Santos L., Smerzi A., Klempt C.

Autors Affiliation: Leibniz Univ Hannover, Inst Quantenopt, D-30167 Hannover, Germany;‎ QSTAR, I-50125 Florence, Italy;‎ CNR, INO, I-50125 Florence, Italy;‎ LENS, I-50019 Sesto Fiorentino, Italy;‎ Aarhus Univ, Inst Fys & Astron, DK-8000 Aarhus C, Denmark; Leibniz Univ Hannover, Inst Theoret Phys, D-30167 Hannover, Germany

Abstract: In 1935, Einstein, Podolsky and Rosen (EPR) questioned the completeness of quantum mechanics by devising a quantum state of two massive particles with maximally correlated space and momentum coordinates. The EPR criterion qualifies such continuous-variable entangled states, where a measurement of one subsystem seemingly allows for a prediction of the second subsystem beyond the Heisenberg uncertainty relation. Up to now, continuous-variable EPR correlations have only been created with photons, while the demonstration of such strongly correlated states with massive particles is still outstanding. Here we report on the creation of an EPR-correlated two-mode squeezed state in an ultracold atomic ensemble. The state shows an EPR entanglement parameter of 0.18(3), which is 2.4 s.d. below the threshold 1/4 of the EPR criterion. We also present a full tomographic reconstruction of the underlying many-particle quantum state. The state presents a resource for tests of quantum nonlocality and a wide variety of applications in the field of continuous-variable quantum information and metrology


Volume: 6      Pages from: 8984-1  to: 8984-8

DOI: 10.1038/ncomms9984

Citations: 81
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